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https://issues.apache.org/jira/browse/KAFKA-6302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277391#comment-16277391
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Matthias J. Sax commented on KAFKA-6302:
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Topic deleting is async -- thus, you will need to put a retry logic into place
in case the topic did not get deleted yet.
> Topic can not be recreated after it is deleted
> ----------------------------------------------
>
> Key: KAFKA-6302
> URL: https://issues.apache.org/jira/browse/KAFKA-6302
> Project: Kafka
> Issue Type: Bug
> Components: admin, clients
> Affects Versions: 1.0.0
> Reporter: kic
>
> I use an embedded kafka for unit test. My application relies on the ability
> to recreate topics programmatically. Currently it is not possible to
> re-create a topic after it has been deleted.
> {code}
> // needs compile time depedency
> 'net.manub:scalatest-embedded-kafka_2.11:1.0.0' and
> 'org.apache.kafka:kafka-clients:1.0.0'
> package kic.kafka.embedded
> import java.util.Properties
> import org.apache.kafka.clients.admin.{AdminClient, NewTopic}
> import org.scalatest._
> import scala.collection.JavaConverters._
> class EmbeddedKafaJavaWrapperTest extends FlatSpec with Matchers {
> val props = new Properties()
> val testTopic = "test-topic"
> "The admin client" should "be able to create, delete and re-create topics"
> in {
> props.setProperty("bootstrap.servers", "localhost:10001")
> props.setProperty("delete.enable.topic", "true")
> props.setProperty("group.id", "test-client")
> props.setProperty("key.deserializer",
> "org.apache.kafka.common.serialization.LongDeserializer")
> props.setProperty("value.deserializer",
> "org.apache.kafka.common.serialization.StringDeserializer")
> props.setProperty("clinet.id", "test-client")
> props.setProperty("key.serializer",
> "org.apache.kafka.common.serialization.LongSerializer")
> props.setProperty("value.serializer",
> "org.apache.kafka.common.serialization.StringSerializer")
> EmbeddedKafaJavaWrapper.start(10001, 10002, props)
> try {
> implicit val admin = AdminClient.create(props)
> // create topic and confirm it exists
> createTopic(testTopic)
> val topics = listTopics()
> info(s"topics: $topics")
> topics should contain(testTopic)
> // now we should be able to send something to this topic
> // TODO create producer and send something
> // delete topic
> deleteTopic(testTopic)
> listTopics() shouldNot contain(testTopic)
> // recreate topic
> createTopic(testTopic)
> // listTopics() should contain(testTopic)
> // and finally consume from the topic and expect to get 0 entries
> // TODO create consumer and poll once
> } finally {
> EmbeddedKafaJavaWrapper.stop()
> }
> }
> def listTopics()(implicit admin: AdminClient) =
> admin.listTopics().names().get()
> def createTopic(topic: String)(implicit admin: AdminClient) =
> admin.createTopics(Seq(new NewTopic(topic, 1, 1)).asJava)
> def deleteTopic(topic: String)(implicit admin: AdminClient) =
> admin.deleteTopics(Seq("test-topic").asJava).all().get()
> }
> {code}
> Btw, what happens to connected producers/consumers when I delete a topic?
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